JPS5911376Y2 - coaxial cable - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a coaxial cable formed by covering two insulated core wires with an outer conductive layer (outer conductor or shingle) and contacting the drain wire with the outer conductive layer.

The outer conductive layer of conventional coaxial cables is made of braided metal wire or spirally wound metal tape, but the manufacturing process is complicated, making it expensive, and the termination process before use is troublesome. It had the following drawbacks.

In view of the above, an object of the present invention is to provide a coaxial cable that can be manufactured at low cost, has good electrical contact between the drain wire and the external conductive layer, and is easy to terminate.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Fig. 1 shows a coaxial cable according to one embodiment of the present invention, in which numeral 1 indicates two insulated core wires each having conductors 2, 2 covered with insulating layers 3, 3 made of polyethylene, etc.; 5 is a drain wire that is in contact with the tape 4, and 6 is a jacket (protective coating layer) made of polyvinyl chloride, polyethylene, etc. that covers the entire body.

This tape 4 has a substantially W-shaped cross section as shown in FIG. are overlapped, the central bent portion reaches and contacts this overlapping portion, and a tape 4 is applied to the outer peripheral surface of each of the two insulated core wires 1, 1.
has made one revolution, and each of the two insulated core wires 1, 1 is completely covered by a closed loop in the form of tape 4.

As shown in FIG. 2, the tape 4 is formed by forming an adhesive layer 41 such as a polyvinyl chloride complex vinyl copolymer or the like on the surface of a metal tape 40 such as aluminum or copper at intervals in the longitudinal direction. 40 exposed portions are arranged alternately in the longitudinal direction.

A reinforcing layer 42 made of polyester, paper, etc. is formed on the back side of the metal tape 40.

This tape 4 is applied vertically onto the insulated core wire 1 with the adhesive layer 41 side facing outward, for example, using a forming machine described below.

FIG. 3 shows an example of a ceremonial machine, and in this figure, a plurality of stands (precept plates) 8 are arranged on a base 7.

Each stand is provided with two holes 81, 81 through which the insulated core wire 1 passes, and a groove 82 through which the tape 4 passes.

As shown in FIG. 4, the groove 82 is gradually deformed into a substantially W-shape along the running direction of the tape, and is integrated with the hole at the end.

Therefore, as shown by the arrow in Fig. 3, two insulated core wires 1,
When the tape 1 and the tape 4 are run, the tape 4 is formed into a substantially W-shape, and at the end of the stand 8, the central bent part of the tape 4, which is shaped into a substantially W-shape, is connected to the two insulated core wires 1. .

After shaping, the tape 4 closes around each insulated core wire 1, 1, as shown in FIG. 1B.

A drain wire 5 is vertically brought into contact with the outer surface of the tape 4 thus formed, and the coaxial cable is completed by covering it with a jacket 6.

In the above embodiment, a case was explained in which a tape was used in which the adhesive layer was shaped perpendicularly to the longitudinal direction of the metal tape, but as shown in FIG. On the other hand, it is also possible to form a coaxial cable diagonally and use this to form a coaxial cable as shown in FIG.

The coaxial cable of FIG. 6 is preferable because the drain wire 5 comes into contact with the metal tape 40 at any position in the length direction. Since we use a tape with an adhesive layer on its surface so that the adhesive layer and exposed parts of the metal tape are arranged alternately in the longitudinal direction, it has good adhesion to the jacket, and when the jacket is peeled off, it can be removed at the same time. The outer conductive layer is cut and removed, eliminating the need for cutting the outer conductive layer, making terminal processing extremely easy.

However, since the longitudinally attached tape for the external conductive layer has an adhesive layer and an exposed metal tape portion alternately appearing on its surface in the longitudinal direction, good electrical contact with the drain wire is achieved in the exposed metal tape portion.

Further, the coaxial cable of the present invention has an extremely simple structure of the longitudinally attached tape serving as the outer conductive layer, and can be manufactured at low cost.

Furthermore, since the metal tape is formed into a substantially W-shape so as to substantially individually wrap each of the two insulated core wires, and is attached vertically to the insulated core wire with both ends overlapping, the two core wires are are individually shielded, which improves electrical characteristics, and each core wire is individually wrapped in metal tape, which holds it firmly. It is possible to prevent the core wire from coming out from inside the metal tape when it is cut.

[Brief explanation of the drawing]

Fig. 1 shows the structure of a coaxial cable according to one embodiment, Fig. 1A is a perspective view, Fig. 1B is a cross-sectional view, Fig. 2 is a perspective view showing a vertical splicing tape, and Fig. 3 is a perspective view. A perspective view showing one example of a commando-forming machine; Figures 4A, B, C, D, and E are cross-sectional views showing the cross-sections of the stand in Figure 3 at each stage of A, B, C, D, and E, respectively; FIG. 5 is a perspective view showing another embodiment of the vertical splicing tape, and FIG. 6 is a perspective view showing the structure of a coaxial cable according to another embodiment. 1... Insulated core wire, 4... External conductive layer vertically attached tape,
41... Adhesive layer, 5... Drain wire, 6...
Jacket.

Claims (1)

[Scope of utility model registration request] A metal tape serving as an external conductive layer is placed on the two insulated core wires, and a drain wire is placed vertically on the metal tape so as to be in contact with the metal tape, and a protective coating layer is applied to the outside of the metal tape and the drain wire. In the coaxial cable, the metal tape has an adhesive layer formed on one surface thereof intermittently in the longitudinal direction so that the adhesive layer and exposed parts of the metal tape alternately appear in the longitudinal direction. The first surface side provided with this adhesive layer is the outside where the drain wire is present, and is approximately W-shaped so as to substantially individually wrap each of the two insulated core wires, and has both ends. A coaxial cable characterized in that these are overlapped and attached vertically to the insulated core wire.